tahakirmani on "Error establishing a database connection"

Hi

I am new to WordPress, I am following a tutorial to Install WordPress. I have followed all the steps but in the end its giving me an error message.
Kindly tell me why is giving me followng error message.
I have also include wp-config file here.

/** The name of the database for WordPress */
define('DB_NAME', 'mydatabase');

/** MySQL database username */
define('DB_USER', 'root');

/** MySQL database password */
define('DB_PASSWORD', 'root');

/** MySQL hostname */
define('DB_HOST', 'localhost:8888');

/** Database Charset to use in creating database tables. */
define('DB_CHARSET', 'utf8');

/** The Database Collate type. Don't change this if in doubt. */
define('DB_COLLATE', '');

ERROR MESSAGE

This either means that the username and password information in your wp-config.php file is incorrect or we can't contact the database server at localhost:8888. This could mean your host's database server is down.

    Are you sure you have the correct username and password?
    Are you sure that you have typed the correct hostname?
    Are you sure that the database server is running?

If you're unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.